linux-kernel - Re: [PATCH] selftests: exec: make binaries position independent

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Date: Tue, 16 Apr 2024 20:27:12 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: Eric Biederman <ebiederm@...ssion.com>, Kees Cook
 <keescook@...omium.org>, Shuah Khan <shuah@...nel.org>,
 Nathan Chancellor <nathan@...nel.org>,
 Nick Desaulniers <ndesaulniers@...gle.com>, Bill Wendling
 <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>,
 Yang Yingliang <yangyingliang@...wei.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: Muhammad Usama Anjum <usama.anjum@...labora.com>, kernel@...labora.com,
 linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
 linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] selftests: exec: make binaries position independent

On 4/16/24 8:23 PM, Muhammad Usama Anjum wrote:
> The -static overrides the -pie and binaries aren't position independent
> anymore. Use -static-pie instead which would produce a static and
> position independent binary. This has been caught by clang's warnings:
> 
>   clang: warning: argument unused during compilation: '-pie'
>   [-Wunused-command-line-argument]
> 
> Tested with both gcc and clang after this change.
> 
> Fixes: 4d1cd3b2c5c1 ("tools/testing/selftests/exec: fix link error")
> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
> ---
>  tools/testing/selftests/exec/Makefile | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/testing/selftests/exec/Makefile b/tools/testing/selftests/exec/Makefile
> index fb4472ddffd81..01940d9165d67 100644
> --- a/tools/testing/selftests/exec/Makefile
> +++ b/tools/testing/selftests/exec/Makefile
> @@ -1,5 +1,5 @@
>  # SPDX-License-Identifier: GPL-2.0
> -CFLAGS = -Wall
> +CFLAGS = -Wall #-Wunused-command-line-argument
Debugging artifact here. I'll resend by removing it as v2

>  CFLAGS += -Wno-nonnull
>  CFLAGS += -D_GNU_SOURCE
>  
> @@ -29,8 +29,8 @@ $(OUTPUT)/execveat.denatured: $(OUTPUT)/execveat
>  	cp $< $@
>  	chmod -x $@
>  $(OUTPUT)/load_address_4096: load_address.c
> -	$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-z,max-page-size=0x1000 -pie -static $< -o $@
> +	$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-z,max-page-size=0x1000 -static-pie $< -o $@
>  $(OUTPUT)/load_address_2097152: load_address.c
> -	$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-z,max-page-size=0x200000 -pie -static $< -o $@
> +	$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-z,max-page-size=0x200000 -static-pie $< -o $@
>  $(OUTPUT)/load_address_16777216: load_address.c
> -	$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-z,max-page-size=0x1000000 -pie -static $< -o $@
> +	$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-z,max-page-size=0x1000000 -static-pie $< -o $@

-- 
BR,
Muhammad Usama Anjum